Towel bar



FIG. 1 is a front perspective view of our new design for a towel bar;

FIG. 2 is a right side view thereof, the left side being the same as the right side;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof, the bottom being the same as the top; and,

FIG. 5 is a rear view thereof. 

The ornamental design for a towel bar, as shown and described. 